Fix #2592 Make the experiment.thumbnail icon paths absolute again, allowing gulp-rev-all to add hashes to them again.
Fix #2592 Make the experiment.thumbnail icon paths absolute again, allowing gulp-rev-all to add hashes to them again.

This breaks storybook for now, but that's not a super high priority at
the moment.

fzzzy/testpilot,flodolo/testpilot,lmorchard/idea-town,mozilla/idea-town,lmorchard/idea-town,chuckharmston/testpilot,chuckharmston/testpilot,chuckharmston/testpilot,lmorchard/idea-town,fzzzy/testpilot,lmorchard/testpilot,fzzzy/testpilot,mozilla/idea-town-server,flodolo/testpilot,mozilla/idea-town,meandavejustice/testpilot,lmorchard/idea-town-server,mozilla/idea-town-server,meandavejustice/testpilot,flodolo/testpilot,fzzzy/testpilot,lmorchard/testpilot,lmorchard/idea-town-server,lmorchard/idea-town-server,meandavejustice/testpilot,lmorchard/testpilot,lmorchard/idea-town-server,meandavejustice/testpilot,mozilla/idea-town,mozilla/idea-town,flodolo/testpilot,chuckharmston/testpilot,lmorchard/idea-town,lmorchard/testpilot,mozilla/idea-town-server,mozilla/idea-town-server